/**
 *    Copyright ${license.git.copyrightYears} the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.codegen.ibatis2.sqlmap.elements;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.dom.OutputUtilities;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.codegen.ibatis2.Ibatis2FormattingUtilities;
import org.mybatis.generator.config.GeneratedKey;

/**
 * 
 * @author Jeff Butler
 * 
 */
public class InsertElementGenerator extends AbstractXmlElementGenerator {

  public InsertElementGenerator() {
    super();
  }

  @Override
  public void addElements(XmlElement parentElement) {
    XmlElement answer = new XmlElement("insert"); //$NON-NLS-1$

    answer.addAttribute(new Attribute("id", introspectedTable.getInsertStatementId())); //$NON-NLS-1$

    FullyQualifiedJavaType parameterType = introspectedTable.getRules().calculateAllFieldsClass();

    answer.addAttribute(new Attribute("parameterClass", //$NON-NLS-1$
        parameterType.getFullyQualifiedName()));

    context.getCommentGenerator().addComment(answer);

    GeneratedKey gk = introspectedTable.getGeneratedKey();

    if (gk != null && gk.isPlacedBeforeInsertInIbatis2()) {
      IntrospectedColumn introspectedColumn = introspectedTable.getColumn(gk.getColumn());
      // if the column is null, then it's a configuration error. The
      // warning has already been reported
      if (introspectedColumn != null) {
        // pre-generated key
        answer.addElement(getSelectKey(introspectedColumn, gk));
      }
    }

    StringBuilder insertClause = new StringBuilder();
    StringBuilder valuesClause = new StringBuilder();

    insertClause.append("insert into "); //$NON-NLS-1$
    insertClause.append(introspectedTable.getFullyQualifiedTableNameAtRuntime());
    insertClause.append(" ("); //$NON-NLS-1$

    valuesClause.append("values ("); //$NON-NLS-1$

    List<String> valuesClauses = new ArrayList<String>();
    Iterator<IntrospectedColumn> iter = introspectedTable.getAllColumns().iterator();
    while (iter.hasNext()) {
      IntrospectedColumn introspectedColumn = iter.next();
      if (introspectedColumn.isIdentity()) {
        // cannot set values on identity fields
        continue;
      }

      insertClause.append(Ibatis2FormattingUtilities.getEscapedColumnName(introspectedColumn));
      valuesClause.append(Ibatis2FormattingUtilities.getParameterClause(introspectedColumn));
      if (iter.hasNext()) {
        insertClause.append(", "); //$NON-NLS-1$
        valuesClause.append(", "); //$NON-NLS-1$
      }

      if (valuesClause.length() > 80) {
        answer.addElement(new TextElement(insertClause.toString()));
        insertClause.setLength(0);
        OutputUtilities.xmlIndent(insertClause, 1);

        valuesClauses.add(valuesClause.toString());
        valuesClause.setLength(0);
        OutputUtilities.xmlIndent(valuesClause, 1);
      }
    }

    insertClause.append(')');
    answer.addElement(new TextElement(insertClause.toString()));

    valuesClause.append(')');
    valuesClauses.add(valuesClause.toString());

    for (String clause : valuesClauses) {
      answer.addElement(new TextElement(clause));
    }

    if (gk != null && !gk.isPlacedBeforeInsertInIbatis2()) {
      IntrospectedColumn introspectedColumn = introspectedTable.getColumn(gk.getColumn());
      // if the column is null, then it's a configuration error. The
      // warning has already been reported
      if (introspectedColumn != null) {
        // pre-generated key
        answer.addElement(getSelectKey(introspectedColumn, gk));
      }
    }

    if (context.getPlugins().sqlMapInsertElementGenerated(answer, introspectedTable)) {
      parentElement.addElement(answer);
    }
  }
}
